CN111806412B - Trailer air pressure braking system and parking braking method thereof - Google Patents
Trailer air pressure braking system and parking braking method thereof Download PDFInfo
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- CN111806412B CN111806412B CN201910293308.2A CN201910293308A CN111806412B CN 111806412 B CN111806412 B CN 111806412B CN 201910293308 A CN201910293308 A CN 201910293308A CN 111806412 B CN111806412 B CN 111806412B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
- B60T15/02—Application and release valves
- B60T15/18—Triple or other relay valves which allow step-wise application or release and which are actuated by brake-pipe pressure variation to connect brake cylinders or equivalent to compressed air or vacuum source or atmosphere
- B60T15/181—Trailer control valves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
- B60T15/02—Application and release valves
- B60T15/18—Triple or other relay valves which allow step-wise application or release and which are actuated by brake-pipe pressure variation to connect brake cylinders or equivalent to compressed air or vacuum source or atmosphere
- B60T15/182—Trailer brake valves
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
- Braking Systems And Boosters (AREA)
Abstract
The invention provides a trailer pneumatic braking system and a parking braking method thereof. A three-pipeline gas circuit connector (red, yellow and white trailer handles) is adopted, and a double-loop service braking system ensures that when one loop fails, the normal work of the other loop is not influenced under the simultaneous action of a four-loop protection valve and a trailer emergency relay valve. The parking brake loop enables the trailer and a brake air chamber spring cavity of the tractor to realize synchronous action and realizes the in-situ spring parking after the trailer is disconnected. The device can be matched with a tractor with a trailer gas circuit joint of three pipelines (red, yellow and white handles) and a tractor with a trailer gas circuit joint of two pipelines (red and yellow handles), and has good adaptability.
Description
Technical Field
The invention relates to the technical field of vehicle braking, in particular to a trailer air pressure braking system and a parking braking method thereof.
Background
Present various military trailer and tractor brake chamber action inconsistent, each series military cross country car, tractor and full trailer air brake connect and are double-circuit (red, yellow joint handshake), and service brake signal gas and parking brake signal gas all connect (yellow joint) entering trailer through the trailer gas circuit, lead to the trailer to distinguish two unable discernments of signal gas, and corresponding trailer brake chamber can only produce diaphragm chamber air brake. When a tractor is parked (a hand brake is pulled up), a brake chamber of the tractor generates spring parking, a brake chamber of a full trailer generates diaphragm air pressure parking, a diaphragm cavity of the trailer air chamber parks air pressure for a long time after the trailer is disconnected, high air pressure exists in a trailer air pipeline for a long time, air leakage of the trailer air pipeline is easily caused, the parking braking force of the trailer disappears, and a slope slips.
In view of the above-mentioned drawbacks, the present inventors have finally obtained the present invention through long-term research and practice.
Disclosure of Invention
In order to solve the technical defects, the invention provides a trailer air pressure braking system and a parking braking method thereof, and the trailer air pressure braking system can realize free switching connection between tractors with three pipelines (red, yellow and white handles) and double pipelines (red and yellow two handles) at an air path joint.
The technical scheme adopted by the invention is as follows:
the trailer air brake system comprises a first trailer air path joint, a second trailer air path joint, a four-loop protection valve, a trailer emergency relay valve, a first traveling relay valve, a second traveling relay valve, a first air bottle and a second air bottle;
the air inlet end of the air passage joint of the second trailer is used for being communicated with a compressed air interface of a tractor, the air outlet end of the air passage joint of the second trailer is communicated with an air inlet of a four-loop protection valve, the air inlet ends of the first air cylinder and the second air cylinder are respectively connected with a first loop interface and a second loop interface of the four-loop protection valve, the air outlet ends of the first air cylinder and the second air cylinder are respectively communicated with the air inlets of a first traveling relay valve and a second traveling relay valve, and the air outlets of the first traveling relay valve and the second traveling relay valve are respectively communicated with a front axle brake air chamber membrane cavity and a rear axle brake air chamber membrane cavity;
the air inlet end that first trailer gas circuit connects is used for putting through the service brake signal gas that comes from the tractor, and its end intercommunication of giving vent to anger the control mouth (No. 4 mouth) of trailer emergency relay valve, two signal gas outlets (No. 2 mouths) of trailer emergency relay valve are linked together with the control mouth of first travelling vehicle relay valve and second travelling vehicle relay valve respectively, air inlet (No. 1 mouth) and the second trailer gas circuit of trailer emergency relay valve connect the intercommunication, the gas outlet (No. 1-No. 2 mouth) and the first gas bottle intercommunication of trailer emergency relay valve.
Furthermore, a first manual switch valve is connected between an air outlet (No. 1-2 port) of the trailer emergency relay valve and the first air bottle.
Furthermore, the trailer air pressure brake system also comprises a third trailer air path joint, a third air bottle, a parking relay valve and a quick release valve;
the air inlet end of the air passage joint of the third trailer is used for communicating a hand braking signal gas from a tractor, the air outlet end of the air passage joint of the third trailer divides the hand braking signal gas into two paths, the first path is communicated with the air inlet of the quick release valve, the second path is communicated with the control port of the parking relay valve, the air outlet of the parking relay valve is communicated with the air inlet of the quick release valve, and the air outlet of the quick release valve is communicated with the spring cavity of the brake air chamber;
and the air inlet end of the third air bottle is connected to a third loop interface of the four-loop protection valve, and the first air outlet end of the third air bottle is communicated with the air inlet of the parking relay valve.
Further, a second air outlet end of the third air bottle is communicated with an air inlet of the quick release valve through a second manual switch valve.
Furthermore, a first two-way check valve is arranged between the second manual switch valve and the air inlet of the quick release valve, one air inlet of the first two-way check valve is communicated with the air outlet end of the second manual switch valve, the other air inlet of the first two-way check valve is communicated with the air outlet end of the third trailer air passage joint and the air outlet of the parking relay valve, and the air outlet of the first two-way check valve is communicated with the air inlet of the quick release valve.
Furthermore, the air outlet end of the air passage joint of the third trailer divides the hand braking signal air into two paths through a flow dividing valve, the first path is communicated with an air inlet end of a second two-way check valve, the other air inlet end of the second two-way check valve is communicated with an air outlet of the parking relay valve, and the air outlet end of the second two-way check valve is communicated with an air inlet of the first two-way check valve.
In another aspect of the present invention, there is provided a parking brake method:
when the three pipelines are in a working state, namely three trailer gas path joints are simultaneously connected with a tractor, the first manual switch valve is kept normally open, the second manual switch valve is kept normally closed, when the tractor releases parking (namely releases the manual brake), the hand brake signal gas entering the third trailer gas path joint is divided into two parts, and one part enters a brake air chamber spring cavity through the first two-way one-way valve; the other path of signal air is connected to a control port of the parking relay valve, so that compressed air of a third air bottle enters a spring cavity of the air chamber through the parking relay valve, and is acted together with the hand braking signal air, and the energy storage spring is pressed back by air pressure, so that parking braking is relieved; when the tractor parks and brakes (pulls up the hand brake), the air path joint of the third trailer cuts off air, compressed air in the air chamber spring cavity is instantly discharged into the atmosphere through the quick release valve, and the trailer parks in place by the spring thrust.
Further, when double-circuit operating condition, first and second trailer gas circuit connects the tractor promptly, and third trailer gas circuit connects and does not connect, keeps first manual switch valve to open normally, and the manual switch valve of second opens normally, and the pneumatic pressure that comes from the third gas cylinder gets into air chamber spring chamber and relieves the parking. When the tractor is disconnected from the trailer, the emergency relay valve of the trailer automatically generates a diaphragm brake to park the trailer in place.
Compared with the prior art, the invention has the beneficial effects that:
the trailer air pressure braking system and the parking braking method thereof provided by the invention can realize free switching connection between tractors with air path joints of three pipelines (red, yellow and white handshake) and double pipelines (red and yellow handshake). The double-loop service braking system ensures that the normal work of another loop is not influenced when one loop fails under the simultaneous action of the four-loop protection valve and the emergency relay valve of the trailer. The parking brake loop enables the trailer and a brake air chamber spring cavity of the tractor to synchronously act, and realizes the original spring parking after the trailer is disconnected.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic view of a trailer pneumatic brake system of the present invention.
Detailed Description
The above and further features and advantages of the present invention are described in more detail below with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to imply that the number of technical features indicated are in fact significant. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two unless explicitly defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Fig. 1 is a schematic view of a trailer pneumatic brake system of the present invention, as shown in fig. 1, the trailer pneumatic brake system comprises a first trailer gas circuit connection 1, a second trailer gas circuit connection 2, a four-circuit protection valve 4, a trailer emergency relay valve 5, a first traveling relay valve 11, a second traveling relay valve 15, a first gas cylinder 7 and a second gas cylinder 8; the air inlet end of the second trailer air passage joint 2 is used for being communicated with a compressed air interface of a tractor, the air outlet end of the second trailer air passage joint is communicated with an air inlet of a four-loop protection valve 4, the air inlet ends of a first air bottle 7 and a second air bottle 8 are respectively connected with a first loop interface and a second loop interface of the four-loop protection valve 4, the air outlet ends of the first air bottle and the second air bottle are respectively communicated with air inlets (No. 1 ports) of a first traveling relay valve 11 and a second traveling relay valve 15, and air outlets (No. 2 ports) of the first traveling relay valve 11 and the second traveling relay valve 15 are respectively communicated with front and rear axle brake air chamber diaphragm cavities; the inlet end that first trailer gas circuit connects 1 is used for putting through the service brake signal gas that comes from the tractor, and its end intercommunication of giving vent to anger the control mouth (No. 4 mouth) of trailer emergency relay valve 5, two signal gas outlets (No. 2 mouths) of trailer emergency relay valve are linked together with the control mouth (No. 4 mouth) of first driving relay valve 11 and second driving relay valve 15 respectively, and the air inlet (No. 1 mouth) and the second trailer gas circuit of trailer emergency relay valve connect the intercommunication, and the gas outlet (No. 1-2 mouth) and the first gas bottle intercommunication of trailer emergency relay valve.
It should be noted that when the tractor treads the foot brake pedal, the compressed air from the tractor enters the four-circuit protection valve 4 through the second trailer air path connector 2 (red connector), and is divided into two independent circuits to enter the two corresponding air cylinders 7 and 8 to supply air to the front axle brake circuit and the rear axle brake circuit. Service brake signal gas from a tractor enters a control port (port No. 4) of an emergency relay valve 5 of the trailer through a first trailer gas circuit connector 1 (yellow connector), a valve core is opened, service brake signal gas is output from two signal gas outlet ports (port No. 2) of the emergency relay valve 5 of the trailer and enters the control ports (port No. 4) of two service relay valves 11 and 15, the valve core is opened, compressed air from a first gas cylinder 7 and a second gas cylinder 8 is received by gas inlets (port No. 1) of the two service relay valves 11 and 15, after the valve core is opened, the gas outlets (port No. 2) and the gas inlets (port No. 1) of the two service relay valves 11 and 15 are communicated, and the compressed air enters a front axle brake air chamber diaphragm chamber and a rear axle brake air chamber, so that braking force is generated. When the tractor loosens the foot brake pedal, the air supply of the air path joint 1 (yellow joint) of the first trailer is cut off, the valve core is closed, and then the air supply of the two signal air outlets (No. 2 ports) of the emergency relay valve 5 of the trailer is cut off, so that the air supply of the control ports (No. 4 ports) of the two travelling relay valves 11 and 15 is cut off, the valve core is closed, the air outlets (No. 2 ports) of the two travelling relay valves 11 and 15 stop supplying air to the diaphragm cavities of the front and rear axle brake air chambers, the air in the diaphragm cavities respectively returns to the two travelling relay valves 11 and 15, and is discharged into the atmosphere through the air outlets (No. 3 ports) of the two travelling relay valves 11 and 15, so that the brake force disappears. The service braking loops of the front axle and the rear axle are simultaneously acted by the four-loop protection valve 4 and the emergency relay valve 5 of the trailer, so that the normal work of another loop is not influenced when one loop fails.
In one embodiment, a first manual switch valve 6 is connected between an air outlet (No. 1-2 port) of the trailer emergency relay valve 5 and a first air bottle 7, and is normally open at ordinary times; if the vehicle is parked and parked for a long time, the first manual switch valve 6 is manually closed, high-pressure air in a service brake loop pipeline is discharged, and the pipeline is prevented from being damaged.
In a more preferred embodiment, the trailer pneumatic brake system further comprises a third trailer air path connector 3 (white connector), a third air bottle 9, a parking relay valve 14 and a quick release valve 13; the air inlet end of a third trailer air path joint 3 (white joint) is used for communicating a hand braking signal gas from a tractor, the air outlet end of the third trailer air path joint divides the hand braking signal gas into two paths, the first path is communicated with the air inlet of the quick release valve 13, the second path is communicated with a control port (No. 4 port) of the parking relay valve 14, the air outlet of the parking relay valve 14 is communicated with the air inlet of the quick release valve 13, and the air outlet of the quick release valve 13 is communicated with a spring cavity of a brake air chamber; the air inlet end of the third air bottle 9 is connected to the third loop interface of the four-loop protection valve 4, and the first air outlet end of the third air bottle is communicated with the air inlet of the parking relay valve 14. And the second air outlet end of the third air bottle 9 is communicated with the air inlet of the quick release valve 13 through the second manual switch valve 10.
In a more specific embodiment, a first two-way check valve 12 is arranged between the second manual switch valve 10 and the air inlet of the quick release valve 13, one air inlet of the first two-way check valve 12 is communicated with the air outlet end of the second manual switch valve 10, the other air inlet thereof is communicated with the air outlet end of the third trailer air channel connector 3 and the air outlet (port No. 2) of the parking relay valve 14, and the air outlet thereof is communicated with the air inlet of the quick release valve 13. The air outlet end of the third trailer air path connector 3 divides the hand brake signal air into two paths through a splitter valve 16, the first path is communicated with an air inlet end of a second double-way check valve 17, the other air inlet end of the second double-way check valve 17 is communicated with an air outlet (No. 2 port) of a parking relay valve 14, and the air outlet end of the second double-way check valve 17 is communicated with an air inlet of a first double-way check valve 12.
It should be noted that when the three pipelines are in a working state, namely three trailer gas circuit joints 1, 2 and 3 (red, yellow and white) are simultaneously connected with a tractor, the first manual switch valve 6 is kept normally open, the second manual switch valve 10 is kept normally closed, when the tractor relieves the parking (namely, the manual brake is released), the hand brake signal gas entering the third trailer gas circuit joint 3 (white) is divided into two parts by the diverter valve 16, one part enters the quick release valve 13 through the second two-way check valve 17 and the first two-way check valve 12 and then enters the spring cavity of the brake air chamber, and the energy storage spring is pressed back by the gas pressure, so that the parking brake is relieved; considering that the air quantity of a part of tractor parking air cylinders may not be enough to instantly and simultaneously release the parking brake of the tractor and the trailer, the other path of signal air is connected to a control port (port No. 4) of the parking relay valve 14, a valve core of the parking relay valve 14 is opened, compressed air of a third air cylinder 9 enters a second two-way check valve 17 through the parking relay valve 14, enters a quick release valve 13 through a first two-way check valve 12 and then enters a spring cavity of a brake air chamber, and then the parking brake is released; when the tractor parks and brakes (pulls up the hand brake), the third trailer gas circuit connector 3 (white) is cut off, so that compressed air in a gas chamber spring cavity is instantly discharged into the atmosphere through the quick release valve 13, and the trailer parks in place by the spring thrust. If the parking is required for a long time, the manual switch valve 6 is manually closed. In addition, after the trailer is disconnected, when the trailer is moved by external force, the second manual switch valve 10 can be opened, and residual compressed air in the third air bottle 9 enters the quick release valve 13 through the first two-way check valve 12 and then enters the spring cavity of the brake air chamber, so that the spring parking is released.
When tractor trailer gas circuit connects when the double circuit, then full trailer also switches into double circuit operating condition, first and second trailer gas circuit connects 1 promptly, 2 (red, yellow) connect the tractor, third trailer gas circuit connects 3 (white joint) and disconnects, keep first manual switch valve 6 to normally open, manual switch valve 10 of second normally open, the high-pressure gas from third gas cylinder 9 passes through second manual switch valve 10, first pair gets into air chamber spring chamber through check valve 12 and quick release valve 13 and relieves the parking. After the tractor is disconnected from the trailer, the trailer emergency relay valve 5 automatically generates diaphragm braking to park the trailer in place. If the trailer is required to be moved by external force, the second manual switch valve 10 can be opened, and residual compressed air in the third air bottle 9 enters the quick release valve 13 through the first two-way check valve 12 and then enters the spring cavity of the brake air chamber, so that the spring parking is released. The trailer can be moved by pushing the black button of the trailer emergency relay valve 5 upward. When the vehicle is parked for a long time, the manual switch valve 6 and the second manual switch valve 10 are manually closed, and the compressed air in the spring chamber is exhausted, so that the spring parking is generated.
The trailer air pressure brake system adopts three-pipeline air path joints (red, yellow and white trailer handles), a double-loop service brake loop and a parking brake loop. The tractor can be matched with a tractor with a trailer gas circuit joint of three pipelines (red, yellow and white), can also be matched with a tractor with a trailer gas circuit joint of two pipelines (red and yellow two-way handles), and has good adaptability. The parking brake loop enables the trailer and a brake air chamber spring cavity of the tractor to realize synchronous action and realizes the in-situ spring parking after the trailer is disconnected. The double-loop service braking system ensures that the normal work of another loop is not influenced when one loop fails under the simultaneous action of the four-loop protection valve and the emergency relay valve of the trailer.
The foregoing is merely a preferred embodiment of this invention, which is intended to be illustrative and not limiting of the invention. The structure, the connection mode and the like of all the components in the invention can be changed, and the equivalent transformation and the improvement on the basis of the technical scheme of the invention are not excluded from the protection scope of the invention.
Claims (7)
1. A trailer pneumatic brake system comprising: first trailer gas circuit connects, second trailer gas circuit connects, its characterized in that still includes: the system comprises a four-loop protection valve, a trailer emergency relay valve, a first travelling relay valve, a second travelling relay valve, a first gas cylinder, a second gas cylinder, a third trailer gas path joint, a third gas cylinder, a parking relay valve and a quick release valve;
the air inlet end of the air passage joint of the second trailer is used for being communicated with a compressed air interface of a tractor, the air outlet end of the air passage joint of the second trailer is communicated with an air inlet of a four-loop protection valve, the air inlet ends of the first air cylinder and the second air cylinder are respectively connected with a first loop interface and a second loop interface of the four-loop protection valve, the air outlet ends of the first air cylinder and the second air cylinder are respectively communicated with the air inlets of a first traveling relay valve and a second traveling relay valve, and the air outlets of the first traveling relay valve and the second traveling relay valve are respectively communicated with a front axle brake air chamber membrane cavity and a rear axle brake air chamber membrane cavity;
the air inlet end of the air passage joint of the first trailer is used for communicating service brake signal air from a tractor, the air outlet end of the air passage joint of the first trailer is communicated with the control port of the emergency relay valve of the trailer, two signal air outlets of the emergency relay valve of the trailer are respectively communicated with the control ports of the first trailer relay valve and the second trailer relay valve, the air inlet of the emergency relay valve of the trailer is communicated with the air passage joint of the second trailer, and the air outlet of the emergency relay valve of the trailer is communicated with the first air bottle;
the air inlet end of the air passage joint of the third trailer is used for communicating a hand braking signal gas from a tractor, the air outlet end of the air passage joint of the third trailer divides the hand braking signal gas into two paths, the first path is communicated with the air inlet of the quick release valve, the second path is communicated with the control port of the parking relay valve, the air outlet of the parking relay valve is communicated with the air inlet of the quick release valve, and the air outlet of the quick release valve is communicated with the spring cavity of the brake air chamber;
and the air inlet end of the third air bottle is connected to a third loop interface of the four-loop protection valve, and the first air outlet end of the third air bottle is communicated with the air inlet of the parking relay valve.
2. A trailer pneumatic brake system as claimed in claim 1 wherein a first manually operable on/off valve is connected between the outlet of the trailer emergency relay valve and the first cylinder.
3. The pneumatic brake system of a trailer as recited in claim 2, wherein the second outlet port of the third gas cylinder is connected to the inlet port of the quick release valve through a second manual switch valve.
4. The pneumatic brake system for trailers as recited in claim 3, wherein a first two-way check valve is arranged between the second manual switch valve and the air inlet of the quick release valve, one air inlet of the first two-way check valve is communicated with the air outlet end of the second manual switch valve, the other air inlet of the first two-way check valve is communicated with the air outlet end of the third trailer air passage joint and the air outlet of the parking relay valve, and the air outlet of the first two-way check valve is communicated with the air inlet of the quick release valve.
5. The pneumatic brake system as recited in claim 4, wherein the outlet port of the third trailer air passage connection splits the hand brake signal air into two paths through a splitter valve, the first path communicating with an inlet port of a second two-way check valve, the other inlet port of the second two-way check valve communicating with the outlet port of the parking relay valve, the outlet port of the second two-way check valve communicating with the inlet port of the first two-way check valve.
6. A parking brake method for use with the trailer pneumatic brake system of claim 5,
when the three pipelines are in a working state, namely three trailer gas path joints are simultaneously connected with a tractor, the normally open state of a first manual switch valve and the normally closed state of a second manual switch valve are kept, when the tractor releases parking, namely when hand brake is released, hand brake signal gas entering the third trailer gas path joint is divided into two parts, and one part enters a spring cavity of a brake air chamber through a first two-way one-way valve; the other path of signal air is connected to a control port of the parking relay valve, so that compressed air of a third air bottle enters a spring cavity of the air chamber through the parking relay valve, and is acted together with the hand braking signal air, and the energy storage spring is pressed back by air pressure, so that parking braking is relieved; when the tractor is parked and braked, namely the hand brake is pulled up, the air path joint of the third trailer is cut off, compressed air in the air chamber spring cavity is instantly discharged into the atmosphere through the quick release valve, and the trailer is parked in place by the spring thrust.
7. A method of parking braking according to claim 6,
when the double-pipeline working state is realized, namely the first trailer gas circuit connector and the second trailer gas circuit connector are connected with a tractor, the third trailer gas circuit connector is not connected, the first manual switch valve is kept normally open, the second manual switch valve is normally open, and the air pressure from the third gas cylinder enters the gas chamber spring cavity to release parking; when the tractor is disconnected from the trailer, the emergency relay valve of the trailer automatically generates diaphragm brake to park the trailer in place.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910293308.2A CN111806412B (en) | 2019-04-12 | 2019-04-12 | Trailer air pressure braking system and parking braking method thereof |
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| CN201910293308.2A CN111806412B (en) | 2019-04-12 | 2019-04-12 | Trailer air pressure braking system and parking braking method thereof |
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| CN111806412A CN111806412A (en) | 2020-10-23 |
| CN111806412B true CN111806412B (en) | 2022-09-23 |
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| CN112248990B (en) * | 2020-12-24 | 2021-03-26 | 天津所托瑞安汽车科技有限公司 | Pneumatic parking system and parking control method thereof |
| CN112660084B (en) * | 2021-01-25 | 2022-03-18 | 郑州宇通重工有限公司 | Traction rod trailer braking system and traction rod trailer |
| CN113119933B (en) * | 2021-04-06 | 2022-05-03 | 广州瑞立科密汽车电子股份有限公司 | Trailer line control unit and brake system |
| CN113291274B (en) * | 2021-06-30 | 2022-03-01 | 三一汽车起重机械有限公司 | Vehicle brake system and work vehicle |
| CN113479175B (en) * | 2021-08-23 | 2022-07-12 | 广州朗晴电动车有限公司 | But braking system device of self-propelled fire control trailer |
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| DE2139213C3 (en) * | 1971-08-05 | 1982-11-25 | Wabco Fahrzeugbremsen Gmbh, 3000 Hannover | Dual-line multi-circuit brake system for trailers |
| DE102008009043B3 (en) * | 2008-02-14 | 2009-05-14 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Electronically controlled braking system with redundant control of the brake actuators |
| CN104709261B (en) * | 2014-05-29 | 2017-06-30 | 湖北三江航天万山特种车辆有限公司 | Full trailor brakes and its braking method |
| US10315638B2 (en) * | 2016-07-07 | 2019-06-11 | Robert Lambertus Dekam | Air braking system |
| CN205836799U (en) * | 2016-07-29 | 2016-12-28 | 东风商用车有限公司 | A kind of emergency brake device |
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| CN111806412A (en) | 2020-10-23 |
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